TW201935158A - Tool, and control circuit and control method for tool - Google Patents

Abstract

To set whether to output a pass signal on an electric driver side, and to enable only a necessary pass signal to be output. This control circuit 128 of an electric driver 100 has: a memory 132 which stores setting data; and a calculation unit 131 which controls the electric driver 100 on the basis of the setting data. The setting data includes: a pass criterion value which indicates a pass criterion for an operation of a tool in each work process; and a pass signal output setting value for setting, for each work process, whether to output the pass signal when the pass criterion is satisfied in each work process. The calculation unit 131 outputs the pass signal when the pass criterion is satisfied and the pass signal output setting value corresponding to the work process at that time is a setting value at which the pass signal is to be output, and does not output the pass signal when the pass signal output setting value is a setting value at which the pass signal is not to be output.

Description

Tool and control circuit and control method of tool

The present invention relates to a control circuit for a tool that operates while sequentially changing control conditions for each work process, a tool having such a control circuit, and a method for controlling the tool.

For example, Patent Document 1 discloses an electric screwdriver that performs a locking operation by rotating and driving a driver bit with an electric motor. In such an electric screwdriver, in general, the user can change settings such as the rotation speed and the tightening torque of the electric motor in accordance with the type of screw or the member to which the screw is locked. In addition, sometimes the production line in the factory will continuously perform different types of screwing operations in accordance with a predetermined order. In this case, the electric screwdriver used in this case is moved to the next operation when the operation is completed. The setting of the driver will be automatically changed to the control conditions required for the operation. In addition, a pass standard is set in advance for each work process, and when the operation of the electric screwdriver of each work process satisfies the pass standard, a pass signal is output to an external device.

The above-mentioned electric screwdriver may be connected to an external device such as a programmable logic controller (PLC), and the external device may perform various actions based on a qualified signal transmitted from the electric screwdriver. As such an operation, for example, there is an operation of closing the lid of the container in which the screw used in the completed work process is accommodated, and simultaneously opening the lid of the container in which the screw used in the next work process is housed.

[Prior technical literature]
[Patent Literature]

[Patent Document 1] International Publication No. 2017/170648

[Problems to be Solved by the Invention]

In the above-mentioned conventional electric screwdrivers, only one of the following can be selected: when the qualification standards are met in each work project, a qualification signal is output whenever each work project is completed, or when all work projects meet the qualification standards, Only a qualified signal is output at the end. However, the external device that receives a qualified signal may perform a predetermined action only when a specific work project among a series of work projects is completed, and may not perform any action when other work projects are completed. As such a case, for example, consider a case where a temporary lock of a screw is performed in a certain work project, then a formal lock of the screw is performed in the next work project, and then another work project is continued. In this case, by performing two operations, the locking operation of the screw is completed at the beginning. Therefore, at the time when the first operation is completed, the external device does not perform the operation even if a qualified signal is received. In this case, the external device must be set in advance to treat the initial qualified signal as an unnecessary signal. In other words, when all the work is completed, the external device connected to the conventional electric screwdriver when the qualified signal is transmitted must be set to ignore unnecessary qualified signals, resulting in a complicated setting operation.

Therefore, an object of the present invention is to provide a control circuit, which is a control circuit for a tool that operates simultaneously while sequentially changing control conditions for each work process. It can set whether to output a qualified signal on the side of the tool and only output necessary qualified signals. It is also an object of the present invention to provide a tool including the control circuit and a method for controlling the tool.

[Means for solving problems]

That is to say, the present invention provides a control circuit, which is a control circuit in a tool that simultaneously changes control conditions for each operation and operates simultaneously, and includes:
An information storage unit that stores setting data for setting control conditions in each work process; and a calculation unit that sequentially changes the control conditions of the tool for each work process based on the setting data,
The setting data includes: a pass reference value, which indicates a pass reference for the operation of the tool in each work process; and a pass signal output set value, which is used to set for each work process when the pass reference is satisfied in each work process Whether to output a qualified signal,
The calculation unit is based on the qualified reference value to determine whether the operation of the tool in each work project satisfies the qualified standard, the qualified signal output setting value that satisfies the qualified standard and corresponds to the current working project is the set value for outputting the qualified signal When the qualified signal is output, the set value of the qualified signal output is not output when the set value of the qualified signal is not output.

In this control circuit, it is possible to set whether or not to output a qualified signal for each operation based on the set value of the qualified signal output, so that unnecessary qualified signals are not transmitted to the connected external device. Thereby, it is not necessary to set the external device side to ignore unnecessary qualified signals, but the setting of the external device can be simplified.

Preferably, when the calculation unit judges that the action of the tool does not satisfy the passing criterion in the work project at this time, it outputs a disqualifying signal.

Furthermore, the present invention includes the control circuit described above, and provides a tool that operates while sequentially changing control conditions for each work process by the control circuit.

Further, the present invention provides a control method, which is a control method of a tool that changes the control conditions and operates simultaneously for each operation project, and includes the following steps:
Steps for reading the setting data saved in the information memory;
Steps of sequentially changing the control conditions of the tool in each operation based on the setting data;
The step of judging whether the operation of the tool in each work project satisfies the pass standard in each work project indicated by the pass reference value included in the setting data; and the output of the pass signal corresponding to the work project at this time is satisfied when the pass standard is satisfied When the value is a set value for outputting a qualified signal, a qualified signal is output to the outside, and when the set value for the qualified signal output is not set, the qualified signal is not output to the outside.

Hereinafter, embodiments of the tool of the present invention will be described based on the attached drawings.

As shown in FIGS. 1 and 2, an electric screwdriver (tool) 100 according to the first embodiment of the present invention includes a tool housing 110, an electric motor 112, which is built into the tool housing 110, and a drill holder 114. It is rotationally driven by the electric motor 112. A driver bit 116 appropriately selected in accordance with a target screw is detachably mounted to the bit holder 114. The tool housing 110 is provided with an input interface 122 having a display portion 118 and an input button 120, and a connection cable 124 for connecting the electric screwdriver 100 to a programmable logic controller (hereinafter referred to as PLC). 123. In the tool housing 110, a motor driving circuit 126 for controlling the driving of the electric motor 112, a control circuit 128 for controlling the entire electric screwdriver 100, and a Hall sensor 130 for detecting The rotation position of the rotor of the electric motor 112. The control circuit 128 includes a calculation section 131 and a memory (information storage section) 132 that stores setting data. The calculation unit 131 controls the electric screwdriver 100 based on the setting data stored in the memory 132.

The setting data stored in the memory 132 includes condition setting data for setting control conditions for each work process. As shown in FIG. 3, the memory 132 of the electric screwdriver 100 can store the first to 30th condition setting data corresponding to the first to 30th work processes. The condition setting data includes setting values indicating the tightening torque or the number of screw locks during the screw lock operation. In addition, for example, a set value for controlling the rotation speed of the electric motor 112 may be included. The condition setting data of the electric screwdriver 100 further includes a pass reference value indicating a pass reference for the operation of the electric screwdriver 100 in each work process. The electric screwdriver 100 includes, as a passing reference value, setting values for the minimum rotation time and the maximum rotation time of the electric motor 112 when the screw-locking operation is performed. For example, when the rotation of the electric motor 112 is stopped in a time shorter than the minimum rotation time, the screw head is positioned earlier than a predetermined time, and the rotation of the electric motor 112 is preset in a time longer than the maximum rotation time. When stopped, the screw head is positioned later than the scheduled time. That is, it can be determined that when the electric motor 112 is stopped earlier than the minimum rotation time or later than the maximum rotation time, it is highly likely that a screw is selected by mistake and the screw lock is performed. When the calculation unit 131 judges that the operation of the electric screwdriver 100 does not satisfy the acceptance criterion, it temporarily stops the operation of the electric screwdriver 100 and outputs a failure signal to the PLC 123 at the same time. The condition setting data also includes a pass signal output setting value, which is used to set whether to pass a pass signal to the outside when the pass criterion is satisfied. The calculation unit 131 may output a qualified signal when determining that the operation of a certain work project satisfies the qualified standard, but whether to output a qualified signal is determined by the set value of the qualified signal output. That is to say, when the set value of the qualified signal output is the set value (ON) of the output qualified signal, the qualified signal is output to the PLC123, and when the set value of the qualified signal is not output (OFF), the qualified signal is not output to the PLC123. Output. These setting values in the condition setting data are respectively set to appropriate values in accordance with the corresponding work processes. Moreover, the above setting items of the condition setting data are examples, and may be other items in accordance with a preset operation project.

The setting data also includes a plurality of order setting data for setting the execution order of the work project. As shown in FIG. 4, the execution order from the first to the 30th can be set in the memory 132 of the electric screwdriver 100, and data indicating each execution order is stored in the memory 132 as sequence setting data. You can set up data in each sequence, and you can register up to 8 jobs. The sequence setting data also includes a secondary action setting value, which is used to set a secondary action after a series of operations are completed. In the electric screwdriver 100, as the secondary action setting value, the setting value (stop) of stopping the operation of the electric screwdriver 100, the setting value (loop) of re-executing a series of work processes in the same execution sequence, and moving Select the setting value (moving to another execution order) of a series of work processes in the execution order based on other order setting data.

The above-mentioned condition setting data and sequence setting data included in the setting data can be arbitrarily changed by operation of the input interface 122. Alternatively, the corresponding data can be transmitted from an external device such as a computer to overwrite the setting data.

When the electric screwdriver 100 is started and predetermined initial settings are completed, the calculation unit 131 reads necessary setting data from the memory 132. Which one of the multiple execution sequences is executed can be arbitrarily selected, and a predetermined method is usually adopted. The calculation unit 131 reads predetermined order setting data corresponding to the specified execution order and sets the execution order of the work process. For example, when the first execution order has been designated, the first order setting data is read. As shown in FIG. 4, the first work process, the second work process, the third work process, and the fourth work process are set as a series. , Which will be executed sequentially. The calculation unit 131 sequentially changes the control conditions for each work process based on the first to fourth condition setting data corresponding to these work processes, and simultaneously operates the electric screwdriver 100. In this embodiment, the first operation engineering system presets temporarily locking four screws, and the second operation engineering system presets the temporarily locked screws to be officially locked. Therefore, if the first operation is completed normally, the four screws will become submerged when the screw head is not in place. In the second operation, these temporarily locked screws will be locked again to make the screw heads on. Position and then tighten it with the specified tightening torque. As a result, the screw locking of the four screws is completed. Since the pass signal output setting value of the first condition setting data is "OFF", the calculation unit 131 does not output a pass signal even if the first operation is normally completed and the pass criterion is satisfied. In addition, since the pass signal output setting value of the second condition setting data is "ON", the calculation unit 131 outputs a pass signal if the second operation is completed normally and the pass criterion is satisfied. Similarly, in the third operation, eight screws are temporarily locked. In the fourth operation, the temporarily locked eight screws are officially locked. When the fourth operation is normally completed, a pass signal is output. Since the secondary action setting value of the first sequence setting data is "End", the operation of the electric screwdriver 100 is stopped when the fourth work process is completed.

As mentioned above, the qualified signal is not output when the temporary locking project, that is, the first and third operation projects are completed, and the qualified signal is output when the formal locking project, that is, the second and fourth operation projects, is completed. Only when the screw is tightened, a qualified signal is received. The PLC123 controls the operation of other peripheral equipment in conjunction with the operation of the electric screwdriver 100. However, in most cases, it is not necessary to perform a certain control every time each work project is completed, but when a predetermined work project is completed Before performing control. In the conventional electric screwdriver 100, a qualified signal is output every time each work project is completed, so it must be set in advance on the PLC123 side to ignore unnecessary qualified signals. In contrast, since the electric screwdriver 100 does not output unnecessary qualified signals, it is not necessary to set the PLC123 to ignore qualified signals. In addition, for example, in the case of further locking the screws after the second operation, the first four screws are locked by completing all the first to third operations. Therefore, if the second operation is completed, If the pass signal output setting value of "is set to" OFF "and the pass signal output setting value at the completion of the new third operation process (further lock process) is set to" ON ", the PLC123 side will not change with the operation process This causes a setting change.

When the second execution order is specified, the second order setting data is read, and the third operation process, the 30th operation process, and the seventh operation process are set as a series of operation processes, and the control is sequentially changed for each operation process. Condition, at the same time, the electric screwdriver 100 will move. Since the second action setting value of the second sequence setting data becomes "loop", when the last operation is completed, the seventh operation is completed, and the original operation is returned to the third operation again, and then the same operation is repeated. engineering.

When the third execution order is specified, the third order setting data is read, and eight work items from the first first work item to the last thirteenth work item are set as a series of work items. The engineering changes the control conditions sequentially, and at the same time, the electric screwdriver 100 will move. Since the secondary action setting value of the third sequence setting data is "Move to the fourth execution sequence", when the last 13th operation is completed, the designated fourth sequence setting data is read, and the fourth execution sequence is set. Move to a series of work processes in the fourth execution sequence. The electric screwdriver 100 continues to operate based on a series of operations in the fourth execution sequence. When the last operation in the fourth execution sequence is completed in the eleventh operation, the next operation setting value of the fourth sequence setting data is "End". ", The operation of the electric screwdriver 100 will stop.

In this way, in the electric screwdriver 100, the secondary operation after completion of a series of work projects based on a certain sequence setting data can be selected from "end", "loop", and "moving to another execution sequence". In particular, since the execution order can be set based on other order setting data, it is not necessary to follow the control of external devices such as PLC 123, and the complicated execution order can be set by the electric screwdriver 100 itself. In addition, if the basic execution order that is often used is set in advance for each order setting data, by setting to appropriately move between these execution orders, it is possible to execute the project faster and easier than to rearrange the execution order from the beginning. change. In addition, as the optional secondary actions, it is not necessary to include the above three, and other secondary actions may be included instead or in addition to these other secondary actions.

In the electric screwdriver 100, the history of work processes performed across a plurality of execution sequences based on a plurality of sequence setting data is also stored in the memory 132. In this case, it is sometimes necessary to re-execute the operation due to a certain operation error, or it must be re-executed from a previous operation according to the actual situation. In this case, based on the history of the work process stored in the memory 132, it is possible to return to the work process that must be executed again. Specifically, by operating the input button 120 of the input interface 122, it is possible to return to the previous work process remaining in the shoe. With the operation of the input button 120, the following return results can be achieved: returning only to the previous job in the current job project, returning to the previous job project, returning to the last job project in the execution order of the previous sequence setting data Or return to the first operation in the execution sequence of the previous sequence setting data. Moreover, the memory 132 of the electric screwdriver 100 is composed of the following memories: non-volatile memory that can be read and written, and flash memory for temporarily storing data required for program operations, etc. In the volatile memory, the setting data is stored in the non-volatile memory, and the resume of the work process is stored in the volatile memory.

As shown in FIGS. 5 and 6, an electric screwdriver 200 according to a second embodiment of the present invention is an electric screwdriver body 202 and a controller 204 for controlling the electric screwdriver body 202. The electric screwdriver body 202 and the controller 204 are connected by a communication cable 206 via communication sections 238a and 238b respectively provided therein. A communication cable 224 connected to the PLC 223 is provided on the side of the controller 204. An electric motor 212, a motor drive circuit 226, and a hall sensor 230 are provided in the tool housing 210 of the electric screwdriver body 202, similar to the electric screwdriver 100 of the first embodiment. The input interface 222 is provided on the side of the controller 204.

In the electric screwdriver 200, calculation units 231a and 231b are provided in the electric screwdriver body 202 and the controller 204, respectively. The two calculation units 231a and 231b communicate with each other via a communication cable 206, and the two calculation units 231a and 231b achieve the same functions as those of the calculation unit 131 in the first embodiment. Similarly, the electric screwdriver body 202 and the controller 204 are provided with memories 232a and 232b, respectively. These two memories 232a and 232b achieve the same functions as the memory 132 of the first embodiment. That is, in this electric screwdriver, the control circuit 228 is dispersedly disposed in the electric screwdriver body 202 and the controller 204.

Furthermore, in this embodiment, the calculation units 231a and 231b and the memories 232a and 232b are dispersedly arranged in the electric screwdriver body 202 and the controller 204, but they may be arranged together in any of the electric screwdriver body 202 and the controller 204 Alternatively, the entire control circuit 228 may be arranged on the side of the controller 204.

As mentioned above, although embodiment of this invention was described, this invention is not limited to these embodiment. For example, in the above embodiment, the tool of the present invention has been described using an electric screwdriver, which is a type of electric tool, as an example. However, the tool may be other electric tools such as a torque wrench or a grinder, or may have a control circuit as described above. The power source is other power tools such as air tools instead of electric motors. The tool of the present invention may also be a hand tool without power. As such a hand tool, for example, a torque wrench having a torque detection function. In this torque wrench, the setting data is stored in the memory of the control circuit. The condition setting data included in the setting data includes the number of locks (control conditions) of the nuts or bolts in each work process or the time of the lock operation. If the tightening operation is performed only in accordance with a predetermined number of tightening times set in the work process, such as a torque reference value (pass standard), the movement is performed to the next work process in accordance with the calculation section of the control circuit, and the control conditions are based on Setting data is changed. In addition, the control circuit compares the torque value detected by the torque detector with the torque reference value during the locking operation, and performs a qualified determination of the locking operation. In the condition setting data, as in the above-mentioned embodiment, a pass signal output setting value is included, and when the tightening action satisfies the torque reference value (pass standard), whether or not a pass signal is output can be arbitrarily set for each work process. Similarly, based on the sequence setting data and the secondary operation setting value, a secondary operation can be selected after completion of a series of work processes set by the sequence setting data.

In addition, the tool of the present invention may be connected to other external devices such as a computer other than a PLC, and may pass a pass signal or a pass signal wirelessly. Further, as the information storage unit for storing the setting data, in addition to the built-in semiconductor memory as described above, a hard disk drive, a recordable medium such as a rewritable CD or DVD, and a removable USB memory can also be used. Other means may be combined arbitrarily.

100‧‧‧ Electric screwdriver (tool)

110‧‧‧tool housing

112‧‧‧ Electric Motor

114‧‧‧bit holder

116‧‧‧driver bit

118‧‧‧Display

120‧‧‧Enter button

122‧‧‧Input interface

123‧‧‧Programmable Logic Controller (PLC)

124‧‧‧ Connect the cable

126‧‧‧Motor drive circuit

128‧‧‧control circuit

130‧‧‧Hall sensor

131‧‧‧Calculation Department

132‧‧‧Memory (Information Memory Department)

200‧‧‧ Electric screwdriver

202‧‧‧ Electric screwdriver body

204‧‧‧Controller

206‧‧‧communication cable

210‧‧‧tool housing

212‧‧‧ Electric Motor

222‧‧‧Input interface

224‧‧‧communication cable

226‧‧‧Motor drive circuit

228‧‧‧Control circuit

230‧‧‧Hall sensor

231a‧‧‧Calculation Department

231b‧‧‧Calculation Department

232a‧‧‧Memory

232b‧‧‧Memory

238a‧‧‧Ministry of Communications

238b‧‧‧Ministry of Communications

FIG. 1 is an external view of an electric screwdriver according to a first embodiment of the present invention.

FIG. 2 is a functional block diagram of the electric screwdriver of FIG. 1.

FIG. 3 is a diagram showing condition setting data stored in a memory.

FIG. 4 is a diagram showing order setting data stored in a memory.

Fig. 5 is an external view of an electric screwdriver according to a second embodiment of the present invention.

FIG. 6 is a functional block diagram of the electric screwdriver of FIG. 5.

Claims (4)

A control circuit is a control circuit in a tool that operates while sequentially changing control conditions for each work project, and includes: An information memory section that stores setting data for setting control conditions in each operation; and A calculation department that sequentially changes the control conditions of the tool for each operation based on the setting data; The setting data includes: a pass reference value, which indicates a pass reference for the operation of the tool in each work process; and a pass signal output set value, which is used to set for each work process when the pass reference is satisfied in each work process Whether to output a qualified signal, The calculation unit is based on the qualified reference value to determine whether the operation of the tool in each work project satisfies the qualified standard, the qualified signal output setting value that satisfies the qualified standard and corresponds to the current working project is the set value for outputting the qualified signal When the qualified signal is output, the set value of the qualified signal output is not output when the set value of the qualified signal is not output. For example, if the control circuit of the scope of patent application is No. 1, wherein the calculation unit judges that the tool's action does not meet the eligibility criteria in the work project at this time, it will output an unqualified signal. A tool is provided with a control circuit of the first or second scope of the patent application, and the control circuit sequentially changes control conditions for each operation and operates simultaneously. A control method is a control method for a power tool that operates sequentially while changing control conditions for each operation, and includes the following steps: Steps for reading the setting data saved in the information memory; Steps of sequentially changing the control conditions of the tool in each operation based on the setting data; The step of judging whether the operation of the tool in each work project satisfies the pass criterion in each work project indicated by the pass reference value included in the setting data; and When the pass criterion is met and the pass signal output setting value corresponding to the operation at this time is the output value of the pass signal, a pass signal is output to the outside, and the pass signal output setting value is not the output value of the pass signal. The step of not outputting the qualified signal to the outside.